The playmaker has been ruled out for the Gunners after limping off in their 4-1 victory over the Russian outfit in the first leg of the quarter-final tie.
“If anything, this week Arsenal should focus,” Keown told the Daily Mail.
“They cannot afford to take liberties in this match.
“CSKA Moscow will take a leaf out of Roma’s book and try to recreate an intimidating atmosphere, but they showed in the first leg they’re at their best when they’re flying forward.
“That will leave space for Arsenal to exploit and I fancy them to score goals, even with Henrikh Mkhitaryan out. His season-ending knee injury is such a disappointment. He’s already made himself indispensable. He’s so nimble and creative, and his absence leaves a void.
“Without him, it’s time for Alex Iwobi to deliver. He has been
“He’s neat and tidy but is not decisive enough. He’s scored more goals for Nigeria than Arsenal this season – two goals in 32 games